Terminal for edgewise wound resistors



Aug. 4, 1936. J. F. FRESE 2,050,221

TERMINAL FOR EDGEWISE WOUND RESISTORS Filed Nov. 20, 1935 l/ la 5 gwen/fof HT Patented Aug. 4, 1936 UNITED STATES PATENT OFFICE TERRIINAL FOR EDGEWISE WOUND RESISTORS Application November 20, 1935, Serial No. 50,795

A 4 Claims. (Cl. 201-63) This invention relates to terminals for rheostat coils composed of metal ribbon wound on edge and mounted on bars which are attached at their ends to cross-bars of a rheostat frame. The fiat 5 metal ribbons are not exible so that they can be bent easily in any direction like round conduc tors, and therefore the terminal is designed for easily securing the ends of edgewise wound resistors thereto. In my co-pending application Serial Number 25,328, filed June 6, 1935, I have shown a terminal for the same purpose as the terminal of the present invention but which it is necessary to place in one position on a crossbar of the rheostat frame to connect to one end of a coil and in an inverted position on an opposing cross-bar to connect to the opposite end of the coil. The terminal of the present invention is an improvement upon the terminal shown in said application in that it is so constructed that it may be used in the same position at either end of the coil, and it also embodies an improved arrangement of the part of the terminal to which conductors other than the resistance coil may be attached, by inclining this part with respect to the part to which the coil is connected, instead of extending the first mentioned part at a right angle to the second, as disclosed in said application.

In the accompanying drawing,

Fig. 1 is a plan view of two edgewise wound resistance coils mounted in a frame, the ends of the coils being connected to terminals of the present invention;

Fig. 2 is a section on the line 2-2 of Fig. 1;

Fig. 3 is a left-hand end view of Fig. 1;

Fig. 4 is a perspective View of the two parts of the terminal;

Fig. 5 is a central section through the cap on the line 5 5 of Fig. 4, and,

Fig. 6 is a perspective View of a fitting to which conductors may be attached.

Referring to the drawing, a and a indicate resistance coils made of metal ribbon wound on edge. The coils arey supported on cores, each consisting of a fiat metal bar I having a toothed insulating covering 2 onto which the coil is threaded and the ends of the fiat bars are mounted upon cross-rods 3 and 4, the cross-rods being surrounded by a tube of insulating material 5 which insulates them from the various parts which they support. The cross-rods extend through flat supporting members 6 and through the ends of fiat side bars 1 which connect the supporting members together to form a frame, the parts, being secured by 'nuts on the ends of the cross-rods, as

shown.

The terminals B for the edgewise wound coils are mounted on the cross-rod 3 and similar terminals B' are mounted on the cross-rod 4. One of these terminals is shown in detail in Fig. 4. The terminals on each cross-rod are spaced from 5 the sides of the frame by spacing members 8. Fittings C and C to which conductors may be attached are arranged between the coil terminals. One of these fittings is shown in Fig. 6. The several parts on the cross-rods, which are insulated l0 from the rods by the insulating tubes 5, are insulated from one another by insulating washers 9. Frames, as shown, carrying any desired number of resistance units, may be arranged with either side uppermost and mounted upon similar frames 15 to form a bank of resistors as illustrated in my application above referredto.

The feature of novelty in the present invention resides in the structure of the terminals B, B'. Each terminal comprises a unitary member b, a 20 cap b' and a bolt for securing these members to gether. In Fig. 4, for the purpose of illustrating its details, the member b is shown inverted with respect to the positions of the corresponding members in the assemblages, Figs. 1 to 3. The 25 member b comprises an elongated relatively dat rectangular part I0 having its edges tapering to ward both ends, as shown at I0, and having a central longitudinal bore Illb extending through it to receive a clamping bolt I1. Bosses II extend 30 laterally from the opposite sides of the part I0 midway betweenits ends and a hole I2, adapted to receive a supporting rod of the frame, extends through said bosses at a. right angle to the bore I0 and at one side thereof. A projection I3 in- 35 clines laterally from said bosses away from the part I0 and extends beyond one end thereof, this projection comprising the parallel arms I 3B and the wall I3 connecting the outer ends of said arms. The wall has a slot I3 midway between its 40 arms and it has a fiat outer surface I3d which is preferably substantially parallel with the longitudinal axis of the part I Il. 'Ihe arms and the wall form a socket to receive the head of a bolt I4 and prevent the bolt from turning, while the 45 slot receives the shank of the bolt. The cap b', which forms a part of the connector, is adapted to fit over either end of the part I0 and it has opposed walls tapering as shown at I5 to correspond with the tapering surfaces IIIn of the part 50 I0. The cap also has a slot I6 through which the end of a resistor ribbon may be extended and a hole .IB through which a bolt I1 may be inserted into the bore Il)b to draw the cap onto the part I0.

One of the fittings C is shown in detail in Fig. 55

@n eer lower Y E* L @i :le hoe nl ich i ner and the loolt il entends downwardly e can said go cl the ce l 'the eine' rd to the shown Fig. 2 might inverted so that the inclined i3 would extend unwardiy instead ci dow wardly and s connec on oi 't coil ends the terminals would he rnade cerne wei", as the part l@ of e et both ends and the can nts ei an upwardly extending coil end, the would he applied to the upper end of part t@ and a downwardly extending cod end, the can wory he jolaced on the lower end or? the nari; to,

fis the coil terminals are arranged with the socleted projections le inclined downwardly, fittings C, C' are arranged with the corresljoornlm ing projections 2l inclined upwardly. These Stings are used for connec' g conductors 'leads cr taps extendingn from intermediate parte ci the resistance coils. Thus, for illustration one end ci a let conductor 2d is connected to a member which is clamped to a convolution ci the coil c, while the other end oi said conductor is secured in the socket ci the 'fitting C' hy a holt 2t which also extends through a terminal 2l oi a wire or cahle, not shown. ln a bank of resistors one of these fittings will he arranged on each supporting rod between adjacent coll terminals, and they may he used for supporting conductors or not, as may loe desired. ln the drawing, the iltting C is shown without a conductor attached to it.

By inclining the soclreted projections of the coil terminals in one direction, as downwardly, and the projections of the ttings C, C in the opposite direction, as upwardly, the electrical devices attached to the terminals and to the fittings are spaced apart and are accessible for attachment or removal, without interference.

What l claim is:

l. A terminal member for an edgewlse wound helical resistance coil comprising a tary metal body-including elongated part tapering at tooth. ends a. h central longitudinal here, a hole receive supporting rod extending the central of said "cody at a right to said here and one side thereof, a ed nted to fit over either ci tapering ends a eci spending. internal taf, er, said can having' c, slot o ueive one end ci; 'the coil hole to receive a holt, and holt lied.

compie elongated neri;

central hole to gnroueh *costes d here one side t to over either oi said. o a correspon .ng inw can having slot to receive d .Troie to 've holt, throng i the can l lore draw the cago wound .helical resistance c co. cody having elongate@ having a longitudinal here, hole to receive supporting rod extending through the central oi said cody at a right angle at one side thereof, e, projection elongated noi-tion e, a rieht angle to the als of said hole and e: g, beyond one end of said portion. and constituting a socket having' a wall with. outer tace, said an onenine therethrough to receive a holt, a can adopted to rit over either ofi said 'tapering and hav= ing a corresponding internal taper, said can hava slot to receive one end ci the coil and a hole to receive a holt, and a holt adapted to extend through the can and into said here to draw the can on to the tapering end to which it is applied.

il terminal mein er for an edgewise wound helical resistance coil comprising a onitenj metal "cody including an elongated oart tapering at looth ends and having a central longitudinal bore, oppositely extending bosses at the sides of said part midway between its ends, a hole to receive a supporting rod extending through. said hosses at a right angle to said bore and at one side thereof, a projection lnclinina' laterally from said bosses away from said part and extending beyond one end thereof and constituting a socket having a wall with a ilat outer surface, said wall having an opening therethrough to receive a holt, a can adapted to over either of the tapering ends of said part and having a corresponding internal taper, said cap having a slot to receive one end of the coil and a hole to receive a bolt, and a bolt adapted to extend through the cap and into said longitudinal here to draw the cap on to the tapering end to which the cap may be applied.

J @SWK F. FRESE.

e to draw the can on to the ion tenerme, at hoth ends 

